If you ask people what their dream Pokemon game is, they'd probably reply with either A) An RPG-style game on a non-handheld Nintendo console or B) an official Pokemon MMO. Now, both of these forget two huge problems. The first is that owning a Nintendo console that was made after the GameCube is like putting "I name all of my knives after famous clowns, and vice versa" on your resume. The second is that releasing a Pokemon MMO sounds less like fun and more like a Purge specifically designed to cause desk chair owners to die of malnutrition. People want these so badly, and the closest we've ever gotten to either are games like Pokemon XD: Gale Of Darkness, a title that smashed together every message board username I had at 13 with a plot that I would've written around the same time.
The shadows make him more mature.
At this point, both games will probably never happen. But that's not the only way that Pokemon mastery often remains a dim campfire across a frozen tundra. It preaches the virtues of "Gotta catch 'em all!" And counting the ones revealed for the upcoming 3DS games, that "all" is 720+ strong. Complaining "Aw, man! There's too many Pokemon! Not like there used to be!" is the wrong way to go about doing things on the eternal high school reunion that is the internet. Plus, people who whine about the "crazy" new Pokemon are purposefully forgetting that the original 150 included stellar examples of creativity like "normal rat" and "inventory item with eyes."
Gotta ignore 'em all.
The issue lies with how you acquire them. The special events that Nintendo holds, which require you to nab them during a certain period of time and trade them from game to game if you want to keep them, are the only way to get certain rare Pokemon, and it is a system that is nearly exclusive to the series. Imagine going to GameStop at 8 a.m. in 2002 to get Link for Super Smash Bros. Melee because he wasn't available in the game and might not be available in the next four games. That sounds like an insane, franchise-breaking concept, but it's how Pokemon does business. Pokemon lets you know that you'll always crave comfort and stability, and that you'll only get what you want if you're lucky.